SYNTECH

I. Product Selection and Preparation

1. Specification Requirements:

• Select industrial-grade SMAS with purity ≥95%
• Confirm absence of metal impurities like Fe³⁺ (content ≤0.5ppm)

2. Mother Solution Preparation:

Chemical

SMAS: 3-5% (mass fraction)
Acrylamide (AM): 5-8%
Deionized water: Balance
Initiator (ammonium persulfate): 0.05-0.1%

*Note: React with stirring at 50-60°C for 4-6 hours to prepare copolymer mother solution*

II. Drilling Fluid System Compatibility

Fluid Type	Recommended Dosage	Applicable pH Range	Temperature Limit
Freshwater	0.3-0.5%	7-9	120°C
Brine	0.5-0.8%	8-10	150°C
Saturated Brine	0.8-1.2%	9-11	180°C

III. Field Operation Procedures

1. Pretreatment:

• Measure base fluid API filtration loss (baseline)
• Adjust pH to 8.5-9.5 (using Na₂CO₃ or NaOH)

2. Dosing Procedure:
   ① Slowly add SMAS copolymer under low-speed agitation (500rpm)
   ② Continue mixing for 30 minutes to ensure complete dispersion
   ③ Test performance after 24-hour aging
3. Performance Monitoring Indicators:

• API filtration loss: Control ≤15ml/30min
• HTHP filtration loss (150°C): ≤25ml/30min
• Rheological parameters: Maintain PV at 8-15cP, YP 3-8lb/100ft²

IV. Key Considerations

1. Compatibility Testing:

• Conduct compatibility tests with common additives (e.g. PAC-LV, SMP)
• Avoid direct mixing with high-valence metal salts (Al³⁺, Cr³⁺)

2. Performance Enhancement:

• Combine with 0.1-0.3% nano-SiO₂ to improve thermal stability
• Add 0.05% EDTA to enhance salt resistance

3. Troubleshooting:

Issue:

Possible causes:
1. System pH<7 causing sulfonate protonation
2. Temperature exceeding 180°C causing degradation
Solutions:
1. Add NaOH to adjust pH
2. Supplement with 0.2% sulfonated phenolic resin

V. Environmental Management

1. Waste treatment:

• Control waste liquid COD <500mg/L (treatable by Fenton oxidation)

2. Biotoxicity:

• 96h LC50 (fish) >1000mg/L, classified as low-toxicity substance

Note: Specific parameters should be adjusted according to formation conditions. Pilot testing is recommended prior to field application.